Electric-Field-Tunable Magnetoexcitons in Xenes-Based van der Waals Heterostructures

We present a comprehensive framework for controlling excitonic phenomena in low-dimensional materials, based on novel van der Waals (vdW) heterostructures composed of Xenes, transition metal dichalcogenides (TMDCs), phosphorene (BP), and transition metal trichalcogenides (TMTCs) [1]. The two-dimensional layers are separated by insulating hexagonal boron nitride (hBN) layers. We theoretically investigate the behavior of Rydberg indirect excitons in Xenes/hBN/TMDC, Xenes/hBN/BP, and Xenes/hBN/TMTC heterostructures subjected to parallel external electric and magnetic fields that are oriented perpendicular to the layers, providing a comprehensive framework for controlling excitonic phenomena in low-dimensional materials. Our results demonstrate that binding energy, diamagnetic energy contributions, and coefficients can be controlled by the electric field strength and by dielectric screening from additional hBN layers. Finally, we explore the potential of time-periodic electric fields with Floquet band-structure engineering.

[1] J. Appl. Phys. 138 (2025); doi: 10.1063/5.0281960